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From: landon donovan on 19 Jun 2010 21:09
Here is my problem if anybody wants and can help me:
I have the next function to plot, with arrows that show the direction of the plot in 3d:

function [h1,h2] = directedplot3(x,c,y,d,varargin)
col=varargin
if nargin < 4, d = []; end
if isempty(d), d = 2; end
if isvector(y), y = y(:); end
if isvector(c), c = c(:); end
[m,n] = size(y);
if isvector(x)
x = x(:);
x = x(:,ones(1,n))
end
k = 2:d:m;
x0 = x(k-1,:)
y0 = y(k-1,:)
c0 = c(1:length(y0))
% u=gradient(x0);
% v=gradient(y0);
u = x(k,:) - x0
v = y(k,:) - y0
w = zeros(length(v),1)
h1 = plot3(x,c,y,varargin{:});
% % [x0,c0,y0]=meshgrid(x0,c0,y0)
% % [u,v,w]=meshgrid(u,v,w)
% % xmin = min(x0(:));
% % xmax = max(x0(:));
% % ymin = min(c0(:));
% % ymax = max(c0(:));
% % zmin = min(y0(:));
% % xrange = linspace(xmin,xmax,16);
% % yrange = linspace(ymin,ymax,16);
% % zrange = 3:4:15;
% % [cx cy cz] = meshgrid(xrange,yrange,zrange);
hold on
h2 = quiver3(x0,c0,y0,u,w,v,0.001,'Color',varargin{:},'MaxHeadSize',0.0001);
%%%h2 = coneplot(x0,c0,y0,u,w,v,5,'nointerp','quiver')%,'Color',varargin{:});
hold on
%set(h2,'Color',varargin{:})
%hold off
where c is constant as x and y vary, i.e. c varies too but not while x and y vary, so i get something like an slice at y=c and x=x and z=y varying, for each value of c.
I tried to adapt the directedplot function in 2d to 3d but I get very big arrows (in spite I set a MaxHeadSize of almost 0)and when i try to plot many graphs in the same figure I get an overloaded and very ugly plot. As you people can see, i rather tried to draw the arrows as cones using coneplot, but I get an error and thats why I commented that part in this code. PLEASE, ANYBODY, could you help me to draw this arrows correctly so I can get a good directed plot in 3D? or explain me how to draw the cones when using coneplot for this case?
PLEASE HELP
VERY MANY THANKS IN ADVANCE
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